Publication details

Authors: Guo, X. F.; Meyung, T.; Yun, Y. H.; Shanov, V. N.; Halsall, H. B.; Heineman, W. R. 
Title: Micro Solid-Contact Ion-Selective Electrode Using a Carbon Nanotube Tower as Ion-to-Electron Transducer and Conductive Substrate 
Type: Journal Article 
Publisher: Electroanalysis 
Year: 2012 
Volume: 24 
Issue: 11 
Start Page: 2045 
End Page: 2048 
DOI: 10.1002/elan.201200348 
Abstract: Solid contact (SC) ion-selective electrodes (ISEs) have been recognized as the next generation of ISEs. In this work, the electrical conductivity and mechanical strength of a carbon nanotube (CNT) tower enable it to play the dual roles of transducer and substrate for micro SC-ISEs. The electrode had a close to Nernstian slope of 35 mV/decade a(Ca2+), a linear range of four orders of magnitude of calcium ion activity (10(-5.6) to 10(-1.8) M), and a detection limit of 1.6x10(-6) M. The simplified fabrication by a one-step drop casting makes miniaturizing SC-ISEs and fabricating sensor arrays easier to achieve. 
Keywords: solid contact, ion-selective electrode, carbon nanotube tower, array, microelectrode, ordered macroporous carbon, optical sensors, bulk optodes, membrane, polymer